The Anabasis of Alexander (; , Alexándrou Anábasis), also known as the History, Campaigns, or (,  De Exp. Alex.; , Historíai Anabáseos Alexandron), was a history of the campaigns or expeditions ("anabasis") into the Persian Empire by Alexander the Great. It was composed centuries after the fact by the historian Arrian. This work consists of seven books and was Arrian's most important work.